Recent questions tagged Opencv

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opencv - Easy ways to detect and crop blocks (paragraphs) of text out of image?

I have done some research on the subject, but I think my question is significantly different from what ... , especially newbie-friendly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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993 views

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opencv - opencv_traincascade always gets stuck

I am trying to use OpenCV's opencv_traincascade to generate a Haar Cascade. So far I have 87 distinctive positive ... count : consumed 87 : 87 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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690 views

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opencv - Finding if two images are similar

I'm trying to find out it two images are similar with openCV using image matching. I'm running the ... images are most probably similar? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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820 views

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opencv - Running OpenMP with different version of g++ in Mac

I recently installed OpenMP on my macOS high Sierra using brew. I can easily run code that has OpenMP ... : unsupported option '-fopenmp' See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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opencv - How to make a virtual camera with python?

I am experimenting with openCV in python and I made a simple webcam that will only show you in black and white but I ... 0xFF == ord('q'): break See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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opencv - How to calculate the distance between ofColors in openframeworks

What I was thinking to do is to convert ofColor to l*a*b color space and measure the euclidean distance. ... should I do it in openframeworks? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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892 views

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opencv - MSVCP100D.dll is missing on your computer debug mode Visual C++ 2012

I know this question was asked before. But I need a real answer, a real explanation! When running (ctrl+F5) the code ... ; //page 27 return 1; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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850 views

1 answer

opencv - Why HoughCircles returns 0 circles while trying to detect irises?

I am trying to detect the eyes' irises but HoughCircles returns 0 circles. The input image(eyes) is: Then I ... find irises, you are welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

opencv - cv::imshow over SSH x11 too slow. alternatives?

I have an application processing live frames from a camera that then spits out the result frame with imshow. ... minimize lag and latency? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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938 views

1 answer

opencv - how to save an array representing an image with 40 band to a .tif file

I have an array with 600 600 40 dimension that each band(from 40 band) represent a 600 600 ... imwrite('image.tif',600by600_just3band_array) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.4k views

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opencv - Pausing and restarting a video in Python

I have several video and I want to go through them frame by frame, and annotate some of them by pressing ... pause/continue option? Thank you! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

1 answer

opencv - How can I combine these two codes? (python image viewer + image ROI crop by mouse drag)

I'm beginner in Python and PyQt. I try to create image viewer based on acbetter's code and want to ... cv2.waitKey(0) cv2.destroyAllWindows() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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995 views

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opencv - LNK2019: unresolved external symbol error in Visual Studio C++

This is my code in Visual Studio C++ #include "stdafx.h" #include<opencvcv.h> #include<opencvhighgui.h> using ... in function _main Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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831 views

1 answer

opencv - How to find the extreme corner point in image ？

Form the source images above ( source image1 image2), I wanna find the extreme corner point and get the ... which are special character ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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736 views

1 answer

opencv - How to extract different shapes from an Image

I am a newbie in Image processing world and I have a problem statement which I need a head start to ... . Pattern Image: Individual Shapes: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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779 views

1 answer

opencv - How to open cv::VideoWriter in Android

I'm using OpenCV 2.4.8 in Android using JNI. I opening the camera with VideoCapture and I want to record ... . Why is not opening correctly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

1 answer

opencv - Motion Sensing by Camera in iOS

I am working on an app in iOS that will occur an event if camera detects some changes in image or we ... to understand links about this. Thanx See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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789 views

1 answer

opencv - Grouping points that represent lines

I am looking for an Algorithm that is able to solve this problem. The problem: I have the following set points ... in thinking of any solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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884 views

1 answer

opencv - How to upload a bytes image on Google Cloud Storage from a Python script

I want to upload an image on Google Cloud Storage from a python script. This is my code: from oauth2client. ... cv2.imread('img.jpg')) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

opencv - How to access pixel values of CV_32F/CV_64F Mat?

I was working on homography and whenever I try to check the values of H matrix (type CV_64F) using H.at<float>( ... 0.000000 Why is this so? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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826 views

1 answer

opencv - Passing bitmap from c# to c++

I have an image processing function written in C++ based on opencv. In my wpf application I have ... exception stating memory access violation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

816 views

1 answer

opencv - Why HoughCircles returns 0 circles while trying to detect irises?

I am trying to detect the eyes' irises but HoughCircles returns 0 circles. The input image(eyes) is: Then I ... find irises, you are welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

731 views

1 answer

opencv - How to find the extreme corner point in image ？

Form the source images above ( source image1 image2), I wanna find the extreme corner point and get the ... which are special character ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.2k views

1 answer

opencv - How to overlay segmented image on top of main image in python

I have an image in RGB and another segmented image in which the pixels have 3 values(segmented image). I want ... an insight about the output. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

opencv - CMake Error at CMakeLists.txt CMAKE_PREFIX_PATH

I have downloaded the source code of the face-analysis SDK from http://face.ci2cv.net/. Now I am trying to get ... idea what to do. Thanks, B See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

opencv - How to detect if a point is contained within a bounding rect - opecv & python

I have a set of points [(x0,y0), (x1,y1), .. ] And a set of bounding rectangles produced using the ... method but it doesnt exist for python. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

843 views

1 answer

opencv - How to detect if a point is contained within a bounding rect - opecv & python

I have a set of points [(x0,y0), (x1,y1), .. ] And a set of bounding rectangles produced using the ... method but it doesnt exist for python. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.3k views

1 answer

opencv c++ find inscribing circle of a contour

I want to find the maximum inscribing circle of contour. I have detected the contour with cv::findContours and it ... the object, maximum area. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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